https://bugs.kde.org/show_bug.cgi?id=504900

--- Comment #7 from Adam Fontenot <adam.m.fontenot+...@gmail.com> ---
Additional suggestion for others who'd like to reproduce this: 

1. Maximize three windows of the same application on the same virtual desktop,
with no other windows open on that desktop.
2. Alternate between hovering the thumbnail previews for the windows in the
icons-only task manager with your cursor.

If you ever see a brief flash of your desktop wallpaper or an inactive window
which is not one of the two you switched between, you're seeing some version of
this issue, because the effect has been tricked into briefly showing the wrong
thing before painting the right thing over it. I see both of these very
frequently, even when flickering doesn't result. I think this is probably
easier to reproduce.

Actually, I'm even able to reproduce this part of the issue with *other* ways
of switching between window previews, including hovering the preview cards for
separate windows in the "Icons and Text" task manager and even alt-tabbing
between windows! I see a brief flash of either the desktop or an unrelated
window after the setup instructions above. I've never gotten strobing with one
of these methods though, so it never occurred to me to report it. Can others
confirm? This is probably downstream of a more general KWin bug.

I'm not sure what causes the effect to sometimes strobe between the right and
wrong previews, but figuring out why it *ever* shows the wrong thing and fixing
that would probably resolve the issue.

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